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Home >> Pontiac >> 2005 >> Aztek Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Engine Control System 3.4L (Introduction)) >> Description and Operation >> Fuel System Description >> Deceleration Mode

Deceleration Mode

WARNING: This page is about a different car, the 2004 Chevrolet Monte Carlo and 2004 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

When the driver releases the accelerator pedal, air flow into the engine is reduced. The PCM reads the corresponding changes in TP, MAP, and MAF. The PCM shuts OFF fuel completely if the deceleration is very rapid, or for long periods, such as long, closed-throttle coast-down. The fuel shuts OFF in order to protect the 3-way catalytic converters (TWC).

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